My First First Love was a good drama. It started kind of slowly and a bit oddly too, but it picked up quickly.
I did like Ji Soo's character and he portrayed him very nicely, with boyish charms and boyfriend quality shots. Jung Jin Young was adorable as well and he is blooming into a great actor. However, the leading lady was a bit annoying. I found her character a bit messy, as she presented two personalities throughout the drama.
Another thing that i didn't like was the way they had ended the drama. The ending could have been a bit more smoothly, even if there is a second season coming soon.
The second couple, finally, was cute and promising. And they provived some solid funny moments overall.
So, seven out of ten.